Adsorption efficiencies of pentachlorophenol from aqueous solution onto biochars

作者：Lang Yin Hai^*; Liu Wei; Wang Hui

来源：China Environmental Science, 2014, 34(8): 2017-2023.

• Adsorption kinetics and isotherm
• Bio chars
• Carbonization temperatures
• Peanut hull
• Pentachlorophenol
• Physicochemical property
• Pseudo second order kinetics
• Wheat straws

The biochars were produced from wheat straw and peanut hull at three pyrolysis temperatures of 300, 400 and 600, respectively. The physico-chemical properties of biochars were characterized by elemental analyzer, scanning electron microscope and BET surface area analyzer, and the adsorption capability of biochars for the removal of pentachlorophenol (PCP) from aqueous solution was evaluated. The results showed that the aromaticity of biochars gradually increased and the polarity decreased with the increasing pyrolysis temperature. The adsorption capability of peanut hull biochars was higher than that of wheat straw biochars. In addition, the adsorption amount of peanut hull and wheat straw biochars under different carbonization temperature followed the order of 400 > 600 > 300. The removal capacity for PCP increased from 81.79% to 89.02% with biochar dosages increase, while the adsorption amount of biochars decreased from 30.32 to 5.54 mg/g. The adsorption kinetics and isotherms of PCP onto biochars were better fitted by pseudo-second-order kinetic and Freundlich equation, respectively. The fast adsorption reaction was the controlled process and lower temperature enhanced the adsorption of PCP from aqueous solution.

• 出版日期2014